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Fix CentOS 6 build.

This commit is contained in:
wb2osz 2019-11-27 20:36:51 -05:00
parent 6e92a4fa48
commit 03939d25ba
2 changed files with 26 additions and 6 deletions
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28
CMakeLists.txt
View File

@ -151,15 +151,35 @@ endif()
if (C_CLANG OR C_GCC)
# _BSD_SOURCE is deprecated we need to use _DEFAULT_SOURCE.
# That might be the case for a more modern compiler but it is still needed
# for CentOS 6 & 7. Without -D_BSD_SOURCE, we get Warning: Implicit declaration of
#
# That works find for more modern compilers but we have issues with:
# Centos 7, gcc 4.8.5, glibc 2.17
# Centos 6, gcc 4.4.7, glibc 2.12
#
# CentOS 6 & 7: Without -D_BSD_SOURCE, we get Warning: Implicit declaration of
# functions alloca, cfmakeraw, scandir, setlinebuf, strcasecmp, strncasecmp, and strsep.
# When a function (like strsep) returns a pointer, the compiler instead assumes a 32 bit
# int and sign extends it out to be a 64 bit pointer. Use the pointer and Kaboom!
#
### Wextra spews out so much noise a serious problem was not noticed.
# CentOS 6: We have additional problem. Without -D_POSIX_C_SOURCE=199309L, we get
# implicit declaration of function clock_gettime and the linker can't find it.
#
# It turns out that -D_GNU_SOURCE can be used instead of both of those. For more information,
# see https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html
#
# Why was this not an issue before? If gcc is used without the -std=c99 option,
# it is perfectly happy with clock_gettime, strsep, etc. but with the c99 option, it no longer
# recognizes a bunch of commonly used functions. Using _GNU_SOURCE, rather than _DEFAULT_SOURCE
# solves the problem for CentOS 6 & 7. This also makes -D_XOPEN_SOURCE= unnecessary.
# I hope it doesn't break with newer versions of glibc.
#
# I also took out -Wextra because it spews out so much noise a serious problem was not noticed.
# It might go back in someday when I have more patience to clean up all the warnings.
#
###set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wvla -ffast-math -ftree-vectorize -D_XOPEN_SOURCE=600 -D_DEFAULT_SOURCE ${EXTRA_FLAGS}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wvla -ffast-math -ftree-vectorize -D_XOPEN_SOURCE=600 -D_DEFAULT_SOURCE -D_BSD_SOURCE ${EXTRA_FLAGS}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wvla -ffast-math -ftree-vectorize -D_GNU_SOURCE ${EXTRA_FLAGS}")
#
#
# for math.h
link_libraries("-lm")
elseif (C_MSVC)

4
src/ax25_pad2.c
View File

@ -796,7 +796,7 @@ int main ()
for (pf = 0; pf <= 1; pf++) {
int cmin, cmax;
int cmin = 0, cmax = 1;
switch (ftype) {
// 0 = response, 1 = command
@ -867,7 +867,7 @@ int main ()
/* SREJ is only S frame which can have information part. */
static char srej_info[] = { 1<<1, 2<<1, 3<<1, 4<<1 };
static unsigned char srej_info[] = { 1<<1, 2<<1, 3<<1, 4<<1 };
ftype = frame_type_S_SREJ;
for (pf = 0; pf <= 1; pf++) {