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Article #7

problems with GCC

#7
From: Chano GĂłmez MartĂ­nez
Date: Tue, 16 Apr 1996 21:52
74 lines
3941 bytes
First of all, I want to apologize for my awful English.

Now, the C stuff :

I'm trying to port a C program from Borland C++ 3.1 to GCC under
Linux.
My problem is that I can't use any function from math.h !!!
The file is correctly #include'd ( in fact, I get no compilation
errors ) but the linker always tells me something like :

/tmp/cca000971.o(.text+0x39): undefined reference to `exp'

The funny thing is that GPC ( the GNU Pascal compiler ) allows me to
use math.h functions lihe exp(), sin(), fabs(), etc, but when I
convert my Pascal programs to C with p2c and try to compile them with
GCC , I get the same error again.

Here is the result from compiling the Pascal source with GPC -v ...
================================================

Reading specs from /usr/lib/gcc-lib/i486-linux/2.6.3/specsgcc version
2.6.3 /usr/lib/gcc-lib/i486-linux/2.6.3/gpc-cpp -lang-pascal -v
-nocharescape -undef -D__GNUC__=2 -D__GPC__=2 -D__GNUC_MINOR__=6
-D__ELF__ -D__unix__ -D__i386__ -D__linux__ -D__unix -D__i386
-D__linux -Asystem(unix) -Asystem(posix) -Acpu(i386) -Amachine(i386)
-D__i486__ mat.p /tmp/cca00103.iGNU CPP version 2.6.3 (i386
Linux/ELF)#include "..." search starts here:#include <...> search
starts here: /usr/local/include /usr/i486-linux/include
/usr/lib/gcc-lib/i486-linux/2.6.3/include /usr/includeEnd of search
list. /usr/lib/gcc-lib/i486-linux/2.6.3/gpc1 /tmp/cca00103.i -quiet
-dumpbase mat.pas -version -o /tmp/cca00103.sGNU PASCAL version 2.6.3
(i386 Linux/ELF) compiled by GNU C version 2.6.3.
/usr/i486-linux/bin/as -V -Qy -o /tmp/cca001031.o /tmp/cca00103.sGNU
assembler version cygnus/linux-2.5.2l.15 (i486-linux), using BFD
version cygnus/linux-2.5.2l.11 /usr/i486-linux/bin/ld -m elf_i386
-dynamic-linker /lib/ld-linux.so.1 /usr/lib/crt1.o /usr/lib/crti.o
/usr/lib/crtbegin.o -L/usr/lib/gcc-lib/i486-linux/2.6.3
-L/usr/i486-linux/lib /tmp/cca001031.o -lgpc -lgcc -lm -lc -lgcc
/usr/lib/crtend.o /usr/lib/crtn.o

=====================

and now the result from GCC :

=============================
Reading specs from /usr/lib/gcc-lib/i486-linux/2.7.0/specsgcc version
2.7.0 /usr/lib/gcc-lib/i486-linux/2.7.0/cpp -lang-c -v -undef
-D__GNUC__=2 -D__GNUC_MINOR__=7 -D__ELF__ -Dunix -Di386 -Dlinux
-D__ELF__ -D__unix__ -D__i386__ -D__linux__ -D__unix -D__i386
-D__linux -Asystem(unix) -Asystem(posix) -Acpu(i386) -Amachine(i386)
-D__i486__ mat.c /tmp/cca00097.iGNU CPP version 2.7.0 (i386
Linux/ELF)#include "..." search starts here:#include <...> search
starts here: /usr/local/include /usr/i486-linux/include
/usr/lib/gcc-lib/i486-linux/2.7.0/include /usr/includeEnd of search
list. /usr/lib/gcc-lib/i486-linux/2.7.0/cc1 /tmp/cca00097.i
-fno-strength-reduce -quiet -dumpbase mat.c -version -o
/tmp/cca00097.sGNU C version 2.7.0 (i386 Linux/ELF) compiled by GNU C
version 2.7.0. /usr/i486-linux/bin/as -V -Qy -o /tmp/cca000971.o
/tmp/cca00097.sGNU assembler version cygnus/linux-2.5.2l.15
(i486-linux), using BFD version cygnus/linux-2.5.2l.11
/usr/i486-linux/bin/ld -m elf_i386 -dynamic-linker /lib/ld-linux.so.1
/usr/lib/crt1.o /usr/lib/crti.o /usr/lib/crtbegin.o
-L/usr/lib/gcc-lib/i486-linux/2.7.0 -L/usr/i486-linux/lib
/tmp/cca000971.o -lgcc -lc -lgcc /usr/lib/crtend.o
/usr/lib/crtn.o/tmp/cca000971.o(.text+0xf): undefined reference to
`PASCAL_MAIN'/tmp/cca000971.o(.text+0x39): undefined reference to
`exp'
===========================

The only apparent difference between both results is in the libraries
( I think)
Can anyone help me, please ???

   Thanks in advance.
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From: chano@ran.es (Chano GĂłmez MartĂ­nez)
Newsgroups: comp.os.linux.setup,comp.os.linux.misc,comp.os.linux,comp.lang.c,comp.lang.c++
Subject: problems with GCC
Date: Tue, 16 Apr 1996 21:52:07 GMT
Organization: RAN INTERNET
Message-ID: <4l1and$iql@news.ran.es>
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