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Eric,
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<div class="">A C++11 compatible compiler is only required for PROJ 6 and onwards. This was introduced with RFC3 [0]. Previous versions was strictly C89, hence the enforcement of that standard in PROJ 5.2.0.</div>
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<div class="">/Kristian</div>
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<div class="">[0] <a href="https://proj.org/community/rfc/rfc-3.html" class="">https://proj.org/community/rfc/rfc-3.html</a><br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 16 Aug 2019, at 14:57, Dechaux Eric CEN (BCQ STIG) <<a href="mailto:eric.dechaux@gendarmerie.interieur.gouv.fr" class="">eric.dechaux@gendarmerie.interieur.gouv.fr</a>> wrote:</div>
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<div class="">Greetings,<br class="">
<br class="">
I have been investigating proj 5.2.0 build failure on Solaris 11.3 for amd64. At some point the build stops on error because of the NAN being not declared :<br class="">
<br class="">
gcc -DHAVE_CONFIG_H -I. -DPROJ_LIB=\"/appli/stig/11.3-20190816-104632/share/proj\" -DMUTEX_pthread -D_FORTIFY_SOURCE=2 -I/usr/include/pcre -I/appli/stig/11.3-20190816-104632/include -Wall -Wdeclaration-after-statement -Wextra -Winit-self -Wunused-parameter
-Wmissing-prototypes -Wmissing-declarations -Wformat -Werror=format-security -Wno-format-nonliteral -Wlogical-op -Wshadow -Werror=vla -Wdeclaration-after-statement -Wdate-time -Wfloat-conversion -std=gnu89 -m64 -O2 -fstack-protector-strong -fpic -fPIC --param=ssp-buffer-size=4
-I/appli/stig/11.3-20190816-104632/include -DHAVE_C99_MATH=1 -MT proj_strtod.o -MD -MP -MF .deps/proj_strtod.Tpo -c -o proj_strtod.o proj_strtod.c<br class="">
gie.c: In function ‘cart_selftest’:<br class="">
gie.c:2008:20: error: ‘NAN’ undeclared (first use in this function)<br class="">
a = proj_coord(NAN, NAN, NAN, NAN);<br class="">
^<br class="">
gie.c:2008:20: note: each undeclared identifier is reported only once for each function it appears in<br class="">
make[2]: *** [gie.o] Erreur 1<br class="">
<br class="">
<br class="">
As the documentation specify a C and C++11 compiler is required I changed the CFLAGS to include -std=gnu11. The build and checks run without errror. Solaris 11.3 is bundled with GCC 5.3 with uses gnu11 by default for C and there should be no reason to force
for it on the CFLAGS.<br class="">
<br class="">
I noticed the configure script detects and automatically adds -std=gnu89 to the CFLAGS :<br class="">
<br class="">
checking whether C compiler accepts -Wdocumentation -Wno-documentation-deprecated-sync... no<br class="">
checking if -std=gnu89 can be enabled... yes<br class="">
checking whether C++ compiler accepts -Wunused-private-field... no<br class="">
<br class="">
<br class="">
On Solaris this disables the NAN macro as it is C99:<br class="">
<br class="">
$ cat test.c<br class="">
#include <stdlib.h><br class="">
#include <math.h><br class="">
<br class="">
int main (void) {<br class="">
<br class="">
float f ;<br class="">
f = NAN ;<br class="">
<br class="">
<br class="">
exit (EXIT_SUCCESS) ;<br class="">
}<br class="">
<br class="">
$ gcc -std=gnu89 test.c<br class="">
test.c: In function ‘main’:<br class="">
test.c:7:6: error: ‘NAN’ undeclared (first use in this function)<br class="">
f = NAN ;<br class="">
^<br class="">
test.c:7:6: note: each undeclared identifier is reported only once for each function it appears in<br class="">
<br class="">
$ gcc -std=gnu99 test.c<br class="">
<br class="">
$ gcc -std=gnu11 test.c<br class="">
<br class="">
<br class="">
<br class="">
What is the purpose of forcing C standard to gnu89 ?<br class="">
<br class="">
<br class="">
<br class="">
Thanks.<br class="">
<br class="">
-- Eric<br class="">
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<br class="">
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