cmake: move global headers to specific checks #11951
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Based on autotools logic in `m4/curl-functions.m4`.
Based on autotools logic in `m4/curl-functions.m4`, `stddef.h` isn't necessary for any detection.
Based on autotools logic in `m4/curl-functions.m4`.
I missed it in 96c2990 curl#11940
vszakats
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We removed C89 `setjmp.h` and `signal.h` detections and excluded them from the global header list we use for detecting functions [1]. Then missed to re-add these headers to the specific functions which need them to be detected [2]. Fix this omission in this patch. `sigsetjmp` has a second detection attempt documented as 'special' in the comment. However this detection uses the same method as the first attempt, with the difference of using `setjmp.h` header only, without including the rest of non-standard headers detected. It detects both function and macro like the first attempt. This second attempt seems redundant. It's been there since the initial commit of CMake support. [1] Follow-up to 3795fcd curl#11951 [2] Follow-up to 96c2990 curl#11940 Closes #xxxxx
vszakats
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Oct 6, 2023
We removed C89 `setjmp.h` and `signal.h` detections and excluded them from the global header list we use when detecting functions [1]. Then missed to re-add these headers to the specific functions which need them to be detected [2]. Fix this omission in this patch. [1] Follow-up to 3795fcd #11951 [2] Follow-up to 96c2990 #11940 Closes #12043
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Before this patch we added standard headers unconditionally to the
global list of headers used for feature checks. This is unnecessary
and also doesn't help CMake 'Generate' performance. This patch moves
these headers to each feature check where they are actually needed.
Stop using
stddef.h, as it seems unnecessary.I've used autotools'
m4/curl-functions.m4to figure out thesedependencies.
Also delete checking for the C89 standard header
time.h, that Imissed in the earlier commit.
Ref: 96c2990 #11940
Closes #11951