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[Antonin Betaille] TP du 12/04 #125

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aaa37a3
crea TP1
Anton1B Mar 22, 2021
641106b
TP1
Anton1B Mar 22, 2021
cbfda38
ajout TP2 22_03
Anton1B Mar 22, 2021
2ff0960
Avancement de la partie 1 du 12/04
Anton1B Apr 12, 2021
dd5aff5
avancement autotools 12/04
Anton1B Apr 12, 2021
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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -21,3 +21,4 @@ Several exercises are available :
* GNU/Linux System Programming
* Embedded system with RPI3
* Usefool Tools (autotools, docker, git, ...)
My new fix
16 changes: 16 additions & 0 deletions labs/autotools/README.md
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Expand Up @@ -52,18 +52,34 @@ de compilation se passe bien.

**Question 1** : En analysant le contenu du fichier *configure.ac*, déterminez
quel header est vérifié pendant la phase de configuration.

sys/socket.h


**Question 2** : Modifiez le fichier *configure.ac* pour forcer l'étape de
configuration à vérifier la présence d'un header inexistant
sur le système. Relancez la phase de configuration et observez
les plaintes! Remettez les choses dans l'ordre lorsque vous
avez terminé.

checking sys/socket_not_found.h usability... no
checking sys/socket_not_found.h presence... no
checking for sys/socket_not_found.h... no
configure: error: "Couldn't find sys/socket.h"


**Question 3** : En cherchant sur le net, déterminez à quoi sert la macro
*AC_ENABLE_SHARED* utilisée dans le fichier *configure.ac*.


Change the default behaviour for LT_INIT to enable shared libraries. This is the default on all systems where Libtool knows how to create shared libraries. The user may still override this default by specifying ‘--disable-shared’. The option ‘shared’ to LT_INIT is a shorthand for this. AM_ENABLE_SHARED is a deprecated alias for AC_ENABLE_SHARED.

**Question 4** : À quoi sert le fichier *Makefile.am*?

Makefile.am is a programmer-defined file and is used by automake to generate the Makefile.in file (the .am stands for automake). The configure script typically seen in source tarballs will use the Makefile.in to generate a Makefile.
The configure script itself is generated from a programmer-defined file named either configure.ac or configure.in (deprecated).
.ac (for autoconf) can be preferable since it differentiates it from the generated Makefile.in files and that way there can be rules such as make dist-clean which runs rm -f *.in. Since it is a generated file, it is not typically stored in a revision system such as Git, SVN, Mercurial or CVS, rather the .ac file would be.

Lorsque la phase de configuration se passe bien, on peut lancer la phase de
compilation :

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