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sectransp.c compiler errors since #8180 #8197

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bagder opened this issue Dec 28, 2021 · 8 comments
Closed

sectransp.c compiler errors since #8180 #8197

bagder opened this issue Dec 28, 2021 · 8 comments
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@bagder
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bagder commented Dec 28, 2021 •
edited

In #8180 we removed != NULL from the checks and now clang on macOS instead reports the errors below. It is not clear to me why.

vtls/sectransp.c:1000:6: error: address of function 'SecCertificateCopyLongDescription' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
  if(SecCertificateCopyLongDescription)
  ~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vtls/sectransp.c:1000:6: note: prefix with the address-of operator to silence this warning
  if(SecCertificateCopyLongDescription)
     ^
     &
vtls/sectransp.c:1007:6: error: address of function 'SecCertificateCopySubjectSummary' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
  if(SecCertificateCopySubjectSummary)
  ~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vtls/sectransp.c:1007:6: note: prefix with the address-of operator to silence this warning
  if(SecCertificateCopySubjectSummary)
     ^
     &
vtls/sectransp.c:1121:6: error: address of function 'SecItemCopyMatching' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
  if(SecItemCopyMatching && kSecClassIdentity) {
     ^~~~~~~~~~~~~~~~~~~ ~~
vtls/sectransp.c:1121:6: note: prefix with the address-of operator to silence this warning
  if(SecItemCopyMatching && kSecClassIdentity) {
     ^
     &
vtls/sectransp.c:1409:6: error: address of function 'SSLSetProtocolVersionMax' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
  if(SSLSetProtocolVersionMax) {
  ~~ ^~~~~~~~~~~~~~~~~~~~~~~~
vtls/sectransp.c:1409:6: note: prefix with the address-of operator to silence this warning
  if(SSLSetProtocolVersionMax) {
     ^
     &
vtls/sectransp.c:1691:6: error: address of function 'SSLCreateContext' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
  if(SSLCreateContext) {  /* use the newer API if available */
  ~~ ^~~~~~~~~~~~~~~~
vtls/sectransp.c:1691:6: note: prefix with the address-of operator to silence this warning
  if(SSLCreateContext) {  /* use the newer API if available */
     ^
     &
vtls/sectransp.c:1725:6: error: address of function 'SSLSetProtocolVersionMax' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
  if(SSLSetProtocolVersionMax) {
  ~~ ^~~~~~~~~~~~~~~~~~~~~~~~
vtls/sectransp.c:1725:6: note: prefix with the address-of operator to silence this warning
  if(SSLSetProtocolVersionMax) {
     ^
     &
vtls/sectransp.c:1983:6: error: address of function 'SSLSetSessionOption' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
  if(SSLSetSessionOption && darwinver_maj >= 13) {
     ^~~~~~~~~~~~~~~~~~~ ~~
vtls/sectransp.c:1983:6: note: prefix with the address-of operator to silence this warning
  if(SSLSetSessionOption && darwinver_maj >= 13) {
     ^
     &
vtls/sectransp.c:2068:6: error: address of function 'SSLSetSessionOption' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
  if(SSLSetSessionOption) {
  ~~ ^~~~~~~~~~~~~~~~~~~
vtls/sectransp.c:2068:6: note: prefix with the address-of operator to silence this warning
  if(SSLSetSessionOption) {
     ^
     &
vtls/sectransp.c:2950:6: error: address of function 'SecTrustEvaluateAsync' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
  if(SecTrustEvaluateAsync) {
  ~~ ^~~~~~~~~~~~~~~~~~~~~
vtls/sectransp.c:2950:6: note: prefix with the address-of operator to silence this warning
  if(SecTrustEvaluateAsync) {
     ^
     &
vtls/sectransp.c:3168:8: error: address of function 'SSLCreateContext' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
    if(SSLCreateContext)
    ~~ ^~~~~~~~~~~~~~~~
vtls/sectransp.c:3168:8: note: prefix with the address-of operator to silence this warning
    if(SSLCreateContext)
       ^
       &
vtls/sectransp.c:3332:6: error: address of function 'SSLSetSessionOption' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
  if(SSLSetSessionOption)
  ~~ ^~~~~~~~~~~~~~~~~~~
vtls/sectransp.c:3332:6: note: prefix with the address-of operator to silence this warning
  if(SSLSetSessionOption)
     ^
     &
11 errors generated.
@jay
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jay commented Dec 28, 2021

however it's being compiled I guess those function addresses are always going to evaluate as true. why it warns on that particular style but not if(func != NULL) or if(&func) I don't know. we had a similar constant expression warning with visual studio a while back and i disabled it entirely 9c1806a

@bagder
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bagder commented Dec 28, 2021

I believe adding -Wno-pointer-bool-conversion will do the job.

bagder added a commit that referenced this issue Dec 28, 2021
@bagder
m4/curl-compilers: tell clang -Wno-pointer-bool-conversion
b210e43 
To hush compiler warnings we don't care for: error: address of function
'X' will always evaluate to 'true'

Fixes #8197
Closes #....
@bagder bagder mentioned this issue Dec 28, 2021
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@gvanem
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gvanem commented Dec 29, 2021

why it warns on that particular style but not if(func != NULL) or if(&func) I don't know.

Probably since those functions always exist and returns CFString values. Which could include a CFNull.

@bagder
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bagder commented Dec 29, 2021

My assumption has been that they aren't always present and that's why the check is there. Because why else check for it?

@bagder bagder closed this as completed in e902183 Dec 29, 2021
@nickzman
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The checks for null in sectransp.c are there to check for a function's presence for weak-linking on old iOS and macOS versions. They have to be there; weak-linking doesn't work without the explicit check for null.

A lot of those checks are quite old, though, and I wonder if many people care if we still support macOS 10.6. 10.6 was released over twelve years ago.

@bagder
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bagder commented Dec 30, 2021

I wonder if many people care if we still support macOS 10.6. 10.6 was released over twelve years ago.

Everything older than 10 years are usually safe to drop, I think. Often we can draw the line earlier as well.

@mback2k
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mback2k commented Jan 2, 2022

As mentioned in 21248e0#r62803533 this is also now triggering warning C4706: assignment within conditional expression.

@bagder
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bagder commented Jan 2, 2022

That is not the only assignment we do within a conditional expression in the source code, and the assignment was already there before we removed != NULL !!

Can we perhaps just silence warning C4706 with MSVC?

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m4/curl-compilers: tell clang -Wno-pointer-bool-conversion curl/curl
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@nickzman @bagder @mback2k @gvanem @jay