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Fix open_memstream/fmemopen feature detection with GCC >= 14 (#544)

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GCC 14 has enabled various warnings as errors by default, e.g.
-Wimplicit-function-declaration. This causes the current feature
detection code for `open_memstream(3)` and `fmemopen(3)` to fail
with GCC 14.

This commit restores compatibility with GCC 14 in this regard.

Note that it may also be beneficial to pass a feature test macro
such as -D_POSIX_C_SOURCE. See the feature test macro requirements
for open_memstream(3)` and `fmemopen(3)`.
This commit is contained in:
Sören Tempel 2024-09-26 04:27:14 +02:00 • committed by GitHub
parent 45686f6c86
commit 26d0e1f9e5
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1 changed files with 3 additions and 2 deletions
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5
Makefile.config
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@ -91,8 +91,9 @@ DESTDIR ?=
# Automatically detect platform-specific flags, instead of using autoconf
#CYC_PLATFORM_HAS_MEMSTREAM ?= 1
CYC_PLATFORM_HAS_MEMSTREAM := $(shell echo "main(){char *buf; int len; open_memstream(&buf, &len);}" | $(CC) -xc - >/dev/null 2>/dev/null && echo 1 || echo 0)
CYC_PLATFORM_HAS_FMEMOPEN := $(shell echo "main(){char *buf; fmemopen(&buf, 0, \"r\");}" | $(CC) -xc - >/dev/null 2>/dev/null && echo 1 || echo 0)
HASH := \# # Needed for compatibility with GNU Make < 4.3 <https://lists.gnu.org/archive/html/info-gnu/2020-01/msg00004.html>
CYC_PLATFORM_HAS_MEMSTREAM := $(shell printf "$(HASH)include <stdio.h>\n%s\n" "int main(void){char *buf; size_t len; open_memstream(&buf, &len); return 0;}" | $(CC) -xc - >/dev/null 2>/dev/null && echo 1 || echo 0)
CYC_PLATFORM_HAS_FMEMOPEN := $(shell printf "$(HASH)include <stdio.h>\n%s\n" "int main(void){char *buf; fmemopen(&buf, 0, \"r\"); return 0;}" | $(CC) -xc - >/dev/null 2>/dev/null && echo 1 || echo 0)
# code from chibi's makefile to detect platform
ifndef PLATFORM